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So far the only way I know to say "I'm sorry" is "lo siento." However, this gets repetitive rather quickly, and sometimes I'm looking for a stronger form of an apology. What other ways are there to apologize in spanish? If you are apologizing for an extremely terrible thing you've done, would you use a different phrase? How do native speakers apologize or convey regret for things they've done?

Very similar in Spain, but here we also use Lo siento when the action is our fault, apart from the use you have explain. ¡Lo siento! no sabía que estabas detrás de la puerta. ¿Te he hecho daño?. If you really regret what you have done you can also add perdona or perdónameat the end: ¡Lo siento! no sabía que estabas detrás de la puerta. ¿Te he hecho daño? Perdona
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itzikiApr 10 '14 at 8:01